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Physics131_L01WI10

# Physics131_L01WI10 - Physics 131 Mechanics Le cture1(C...

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Physics 131 - Mechanics Lecture 1 (Chapter 1) Units January 4, 2010 Homeyra Sadaghiani

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January 9, 2008 Physics 131 - Lecture 2 2 Announcements HW#0 is due at 9AM on Friday, January 8th. Class introduction is due Sunday January 10 th by midnight. The i-Clickers for this class may be registered on the Web at: http://www.iclicker.com/registration/
Week Date L# Lecture topic Text reading HW 1 4-Jan 1 Description of course structure, SI units 6-Jan 2 Motion, position, velocity, acceleration 1.1-8 (26 P) HW#0 8-Jan 3 One-dimensional motion 2.1-3 (14 P) 2 11-Jan F1 Furlough (Constant acceleration -Tutorial)   13-Jan 4 Vectors 3.1-4 (13 P) HW#1   15-Jan 5 Constant acceleration 2.4-7 (14 P)   3 18-Jan H1 Holiday (Martin Luther King's Birthday)   20-Jan 6 Two- dimensional motion 4.1-3 (12 P) HW#2   22-Jan 7 Circular and relative motion 4.3-7 (14 P) 4 25-Jan 8 Force, mass, inertial frames 5.1-4 (11 P)   27-Jan 9 5.5-7 (8 P) HW#3 29-Jan E1 EXAM 1- Chapters 1-4 January 7, 2009 Physics 131 - Lecture 1 3 Lecture Schedule We are here!

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January 7, 2009 Physics 131 - Lecture 1 4 Standard International Units Standard International (SI) Units (also known as MKS) Mass: kilogram kg Length: meter m Time: second s Unit Conversions 1 in = 2.54 cm 1 cm = 0.3937 in 1 mi = 1.609 km 1 km = 0.621 mi 1 mph = 0.447 m/s 1 m/s = 2.24 mph Note: the English pound unit is a measure of force or weight , not mass. A kilogram has a weight of 2.2046 pounds at standard gravity. } English Units (Used only in USA, Liberia, and Myanmar) Units for almost all other physical quantities can be constructed from mass, length, and time, so these are the fundamental units.
The kilogram was originally defined as the mass of 1 liter of water at 4 o C. Currently, 1 kilogram is the mass of the international standard kilogram, a polished platinum-iridium cylinder stored in S è veres, France. (It is currently the only SI unit defined by a manufactured object.) Avagadro’s number of carbon-12 atoms (6.02214199… x 10 23 ) has a mass of exactly 12 kg. January 7, 2009 Physics 131 - Lecture 1 5 SI Mass Unit - kilogram (kg)

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January 7, 2009 Physics 131 - Lecture 1 6 SI Length Unit - meter (m) The meter was originally defined as 1/10,000,000 of the distance from the Earth’s equator to its North pole on the line of longitude that passes through Paris. Currently, 1 meter is the distance traveled by light in 1/299,792,458 of a second.
Physics 131 - Lecture 1 7 SI Time Unit - second (s) The second was originally defined as (1/60)(1/60)(1/24) of a mean solar day. Currently, 1 second is defined as 9,192,631,770 oscillations of the radio waves absorbed by a vapor of cesium-133 atoms. 13

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Physics131_L01WI10 - Physics 131 Mechanics Le cture1(C...

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